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<p>This study examines the improved degradation of Methylene Blue (MB) dye using photocatalysts of green synthesized cerium oxide (CeO<sub>2</sub>) nanoparticles and Ni<sup>2</sup>⁺ doped, Mg<sup>2</sup>⁺ doped CeO<sub>2</sub> nanoparticles. The nanoparticles of CeO<sub>2</sub> synthesized through the plant-mediated method, which is eco-friendly in nature. Characterization using x-ray diffraction (XRD), scanning electron microscopy (SEM), and UV–vis spectroscopy confirmed that a cubic fluorite structure has been formed with crystallite sizes of CeO<sub>2</sub> 6.15&#xa0;nm, Ni<sup>2+</sup> 5.59&#xa0;nm-doped, and Mg<sup>2+</sup> 5.19&#xa0;nm-doped CeO<sub>2</sub>. UV–Visible analysis shows band gap reduction to 3.36 and 3.24&#xa0;eV, indicating improved visible-light absorption through doping. The tests of photocatalytic activity show that the CeO<sub>2</sub> has 79% degradation efficiency, and Ni<sup>2</sup>⁺-doped and Mg<sup>2</sup>⁺-doped CeO<sub>2</sub> has 93 and 94%, respectively. The findings show that the photocatalytic property of Ni<sup>2</sup>⁺ and Mg<sup>2</sup>⁺ doped CeO<sub>2</sub> nanoparticles is improved and this enhancement makes these nanoparticles suitable for environmental remediation application.</p>

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Improved dye degradation performance of green-synthesized Ni2⁺ and Mg2⁺ doped CeO2 photocatalysts

  • 期刊论文

  • 发表日期：

    2026年3月24日

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  • M. Varusai Mohamed,
  • A. Jafar Ahamed,
  • H. Mohamed Kasim Sheit,
  • K. S. Mohan,
  • A. Samsathbegum

摘要

This study examines the improved degradation of Methylene Blue (MB) dye using photocatalysts of green synthesized cerium oxide (CeO2) nanoparticles and Ni2⁺ doped, Mg2⁺ doped CeO2 nanoparticles. The nanoparticles of CeO2 synthesized through the plant-mediated method, which is eco-friendly in nature. Characterization using x-ray diffraction (XRD), scanning electron microscopy (SEM), and UV–vis spectroscopy confirmed that a cubic fluorite structure has been formed with crystallite sizes of CeO2 6.15 nm, Ni2+ 5.59 nm-doped, and Mg2+ 5.19 nm-doped CeO2. UV–Visible analysis shows band gap reduction to 3.36 and 3.24 eV, indicating improved visible-light absorption through doping. The tests of photocatalytic activity show that the CeO2 has 79% degradation efficiency, and Ni2⁺-doped and Mg2⁺-doped CeO2 has 93 and 94%, respectively. The findings show that the photocatalytic property of Ni2⁺ and Mg2⁺ doped CeO2 nanoparticles is improved and this enhancement makes these nanoparticles suitable for environmental remediation application.